My new manga- H.E.A.R.T

If anyone wants to help with my manga, please do.

Storyline: Meiko Asahina is a 15 year old student. While moving, she accidentally transfers to a boys only school. She had no choice so, she dressed up like a boy to get in the school, at first no one knows, then she meets a boy Kenji Yamazaki. He was in the same grade as her. They soon became best friends, but her secret still hidden from him. How long can she keep her secret?